Open Access

Bounds on SMEFT affecting multigauge and Higgs-gauge couplings using two and three body spin correlations in $e^{-} e^{+} \to 2 j e^{-} e^{+} μ E$ process

Amir Subba ^1,2,* and Ritesh K. Singh ^2,†

¹Department of Physics, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
²Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal 741246, India

^*Contact author: amirsubba@iitg.ac.in
^†Contact author: ritesh.singh@iiserkol.ac.in

Phys. Rev. D 113, 035026 – Published 23 February, 2026

DOI: https://doi.org/10.1103/ntgz-czmt

Abstract

The upcoming electron-positron collider provides an ideal place to probe deviation from the Standard Model predictions with its clean environment, beam polarization, and significant luminosity. We studied anomalous quartic gauge boson couplings ( $V V W^{-} W^{+}, V \in {γ, Z}$ ), triple gauge couplings ( $W^{-} W^{+} γ / Z$ ), and Higgs-gauge couplings $(H V V, V \in {W^{\pm}, Z, γ})$ induced by $S U (2)_{L} \times U (1)_{Y}$ gauge-invariant dimension-6 operators in $2 j e^{-} e^{+} μ E$ final events with initial beam polarization. The phase space of two prominent amplitudes—i.e., triple gauge boson production ( $W W Z$ ) and vector boson scattering subprocesses—are selected with kinematic cuts on $m_{e^{-} e^{+}}$ . The full quantum states of the diboson system in vector boson scattering (VBS) and the triboson system in $W W Z$ are given by 80 and 728 independent parameters (polarizations and spin correlations), respectively, which are obtained in the form of angular asymmetries. Further, the reconstruction of vector polarization asymmetries associated with the $W$ boson and their correlations requires flavor tagging of light jets and is thus neglected. We provide one-parameter limits at a 95% confidence level, combining cross section and spin-related observables. The projected one-parameter constraints on Wilson coefficients (WCs) are found to be more stringent than the current limits reported by the LHC experiments. A channel study highlights that $W W Z$ puts stringent bounds on two $C P$ -even WCs, viz. $c_{W}$ and $c_{W W W}$ , while VBS topology puts stringent bounds on the remaining seven WCs. Finally, marginalized limits on all nine anomalous couplings are obtained with Markov chain Monte Carlo analysis. The limits are found to be insensitive to systematic errors and dominated by statistics.

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Phys. Rev. D 113, 035026– Published 23 February, 2026

Vol. 113, Iss. 3 — 1 February 2026

Received 20 September 2025
Accepted 29 January 2026

DOI: https://doi.org/10.1103/ntgz-czmt

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Bounds on SMEFT affecting multigauge and Higgs-gauge couplings using two and three body spin correlations in $e^{-} e^{+} \to 2 j e^{-} e^{+} μ E$ process

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Bounds on SMEFT affecting multigauge and Higgs-gauge couplings using two and three body spin correlations in e−e+→2je−e+μE process

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Bounds on SMEFT affecting multigauge and Higgs-gauge couplings using two and three body spin correlations in $e^{-} e^{+} \to 2 j e^{-} e^{+} μ E$ process